Valve for blast machines



Oct. 3l, 1939. J. E. HUFF 2.177,888

VALVE FOR BLAST MACHINES Filed Nov. 5, 1938 I l l Patented oct. 31, 1939 I 2,177,888

UNITED STATES PATENT OFFICE VALVE FOR BLAST MACHINES James E. Huff, Independence, Kans.

Application November 5, 1938, Serial No. 239,129

8 Claims. (Cl. 251-27) The invention relates to valves for sand blast is held therein by a screw plug or the like I3, said and similar machines in which sand or other seat plug being preferably formed from elastic abrasive is discharged into a valve body from rubber. A valve plug I4 is slidably mounted in a tank and is mixed with a stream of compressed the tubular boss I I and is also preferably formed 5' air and discharged from said body through a hose from elastic rubber. The two plugs I2 and I4 are 5 or the like, provided with'opposed inner end faces l5 and IS The principal object of the invention is to prorespectively which converge downwardly to guide vide a new and improved valve for controlling the abrasive into the compressed air stream the discharge of abrasive and effecting such which is directed across the lower closed end of l thorough mixture with the air stream that no the body 5, and the quantity of abrasive descendn 10` abrasive can accumulate to cause clogging, even ing between said faces I and I6, may be conif damp i trolled by adjusting the valve plug I4 toward or In carrying out the above end, a further ob from the seat plug I2, as required. ject is to provide a movable valve member of A suitable closure Il is provided for the outer elastic rubber or similar elastic material, and a end of the boss II, said closure having a stuffing 15 seat member of like material for coaction with box I8. A stem I9 passes through this stuffing said valve member and I have discovered that box and is threaded through the closure I1, the these elastic valve and seat members will possess inner `end of said stem being provided with a` much greater resistance to the abrasive action of swivel connection to which the valve plug M 20 the sand or the like, than has been heretofore is detachably connected by means of a screw 2l. 20 possible with other types of valves and seats. The outer end of the stem I9 is provided with a A still further object is to provide a simple and suitable hand wheel 22 and it will be seen that inexpensive construction, yet one which will be rotation of this wheel will effect inward or out* highly efficient and long-lived. ward movement of the valve plug It, as required.

25 With the foregoing in view, the invention re- When this plug is entirely closed, its lower por- 25 sides in the novel subject matter hereinafter tion abuts the corresponding portion of the plug described and claimed, description being accom- I2 and these abutting portions compress to form plished by reference to the accompanying drawa tight cut-off for the abrasive. Not only does ing. this advantage exist for having the valve mem- Figure 1 is a perspective view showing the apber I4 and the seat member I2 formed from rub- 30 plication of the valve. ber or other elastic material, but the further ad- Figure 2 is a vertical longitudinal sectional vantage exists that said parts will have much view. longer life thanV if formed from other materials, Figure 3 is a vertical transverse sectional view it having been found that the elastic nature of on line 3-3 of Fig. 2. the parts in question will more effectively resist 35 A construction has been disclosed which has the abrasive action of the sand or the like proven advantageous from al1 standpoints and is descending between the valve and seat. therefore preferably followed. However, it is In use, the body 5 is suitably coupled at 23 to to be understood that within the scope of the inthe lower end of the tank 1, the usual air line vention as claimed, numerous variations may be 24 from the compressor or compressed air tank is 40 made. connected with the compressed air inlet 8, and A body 5 of any preferred metal is provided, the discharge hose 26 for the mixture of abrasive said body being preferably of cross shape. and air, is coupled to the outlet 9. The line 24 Formed vertically through this body 5, is an is usually provided with a branch 2l extending abrasive passage t, the `upper end of said passage to the upper end of the tank 'I to create a force 45 being open to receive the sand or other abrasive feed for the abrasive. This abrasive readily disfrom the usual tank 'I. The lower end of the charges between the seat member I2 and valve passage 6 is closed, and opposite sides of this member I4 which may be relatively adjusted as closed end are provided with a compressed air required, and the descending abrasive encounters inlet 8 and an abrasive outlet 9 which are alined the compressed air blast, mixes thoroughly there- 50 transversely of the passage. Near the inlet 8 with and discharges through the hose 26. No and outlet 9, the body 5 is provided with alined matter if the abrasive be somewhat damp, it canoppositely projecting tubular bosses I0 and II not cause clogging of the valve for there are no which communicate with the passage 6. A seat spaces in which it can become packed. plug I2 is mounted in the tubular boss I0 and Excellent results have been obtained from the 55 construction shown and described and it is therefore preferably followed, as above stated. However, attention is again invited to the possibility of making variations within the scope of the invention as claimed.

What is claimed is:

1. A valve comprising a body having a flow passage, a seat member mounted at one side of said passage, a valve member mounted at the opposite side of said passage, the two members being provided with inner opposed faces which converge toward the discharge end of said passage, and means for adjusting said valve member toward and from said seat member.

2. A structure as specified in claim l; said members being formed of elastic material to resist abrasive wear and to compress and tightly engage each other when said valve member is entirely closed.

3. A structure as specified in claim 1; said members being formed of elastic rubber to resist abrasive wear and to compress and tightly engage each other when said valve member is entirely closed.

4. A valve comprising a body having a flow passage and two alined tubular outwardly projecting bosses at and communicating with opposite sides of said passage, a seat plug mounted in one of said tubular bosses and inwardly exposed at one side of said passage, a Valve plug slidably mounted in the other of said tubular bosses and also inwardly exposed, and means for adjusting said valve plug toward and from said seat plug, said plugs having opposed inner end faces which converge toward the discharge end of said passage.

5. A valve comprising a body having a flow passage and two alined tubular outwardly projecting bosses at and communicating with opposite sides of said passage, a seat plug mounted in one of said tubular bosses and inwardly exposed at one side of said passage, a valve plug slidably mounted in the other of said tubular bosses and also inwardly exposed, and means for adjusting said valve plug toward and from said seat plug, said plugs being formed from elastic material and having opposed inner end surfaces which converge toward the discharge end of said passage.

6. A valve comprising a body having a straight flow passage open at one end to receive a granular abrasive and closed at its other end, this closed end of said passage being provided with a compressed air inlet and an air-andabrasive outlet alined transversely of the passage, said body being provided near said closed end with two alined outwardly projecting bosses at and communicating with opposite sides of said passage, a seat plug mounted in one of said tubular bosses and inwardly exposed at one side of said passage, a valve plug mounted in the other of said tubular bosses and also inwardly exposed, a closure for said one boss to retain said seat plug therein, a closure for said other boss, and an adjusting screw for said valve plug threaded through this latter closure, said plugs having op posed inner end surfaces which converge toward said closed end of said passage.

7. A valve comprising a body having a straight flow passage open at one end to receive a granu- 'lar abrasive and closed at its other end, this closed end of said passage being provided with a compressed air inlet and an air-and-abrasive outlet alined transversely of the passage, said body being provided near said closed end with two alined outwardly projecting bosses at and communicating with opposite sides of said passage, a seat plug mounted in one of said tubular bosses and inwardly exposed at one side of said passage, a valve plug mounted in the other of said tubular bosses and also inwardly exposed, a closure for said one boss to retain said seat plug therein, a closure for said other boss, and an adjusting screw for said valve plug threaded through this latter closure, said plugs being formed from elastic material and having opposed inner end surfaces which converge toward said closed end of said passage.

8. A valve comprising a body having a straight flow passage open at one end to receive a granular abrasive and closed at its other end, this closed end of said passage being provided with a compressed air inlet and an air-and-abrasive outlet alined transversely of the passage, said body being provided near said closed end with two alined outwardly projecting bosses at and communicating with opposite sides of said passage, a seat plug mounted in one of said tubular bosses and inwardly exposed at one side of said passage, a valve plug mounted in the other of said tubular bosses and also inwardly exposed, a closure for said one boss to retain said seat plug therein, a closure for said other boss, and an adjusting screw for said valve plug threaded through this latter closure, said plugs being formed from elastic rubber and having opposed inner end surfaces which converge toward said closed end of said passage.

JAMES E. HU'FF. 

